package com.springboot.demo.util;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.util.*;

/*
 * 类描述：json工具类
 * @auther 逍遥若峰
 * @create 2019年6月3日11:12:06
 */
public class JsonUtil {

        private static SimpleDateFormat sdf = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");

        // 将JSON转换成Map,其中valueClz为Map中value的Class,keyArray为Map的key
        public static Map json2Map(Object[] keyArray, String json, Class valueClz) {
            JSONObject jsonObject = JSONObject.fromObject(json);
            Map classMap = new HashMap();
            for (int i = 0; i < keyArray.length; i++) {
                classMap.put(keyArray[i], valueClz);
            }
            return (Map) JSONObject.toBean(jsonObject, Map.class, classMap);
        }

        /***
         * 将对象转换为传入类型的List
         *
         * @param object
         * @param objectClass
         * @return
         */
        public static <T> Collection<T> toList(Object object, Class<T> objectClass) {
            JSONArray jsonArray = JSONArray.fromObject(object);
            return JSONArray.toCollection(jsonArray, objectClass);
        }

        /**
         * 功能描述：实现将一个object对象转换为json的string字符串
         * @param obj
         * @return
         */
        public static String object2json(Object obj) {
            StringBuilder json = new StringBuilder();
            if (obj == null) {
                json.append("\"\"");
            } else if (obj instanceof String || obj instanceof BigDecimal
                    || obj instanceof BigInteger) {
                json.append("\"").append(string2json(obj.toString())).append("\"");
            } else if (obj instanceof Boolean) {
                json.append(Boolean.valueOf(obj.toString()));
            } else if (obj instanceof Integer || obj instanceof Float
                    || obj instanceof Short || obj instanceof Double
                    || obj instanceof Long || obj instanceof Byte) {
                json.append(obj.toString());
            } else if (obj instanceof Date || obj instanceof java.sql.Date) {
                json.append("\"").append(sdf.format(obj)).append("\"");
            } else if (obj instanceof Object[]) {
                json.append(array2json((Object[]) obj));
            } else if (obj instanceof List) {
                json.append(list2json((List<?>) obj));
            } else if (obj instanceof Map) {
                json.append(map2json((Map<?, ?>) obj));
            } else if (obj instanceof Set) {
                json.append(set2json((Set<?>) obj));
            } else {
                json.append(bean2json(obj));
            }
            return json.toString();
        }

        public static String list2json(List<?> list) {
            StringBuilder json = new StringBuilder();
            json.append("[");
            if (list != null && list.size() > 0) {
                for (Object obj : list) {
                    json.append(object2json(obj));
                    json.append(",");
                }
                json.setCharAt(json.length() - 1, ']');
            } else {
                json.append("]");
            }
            return json.toString();
        }

        public static String array2json(Object[] array) {
            StringBuilder json = new StringBuilder();
            json.append("[");
            if (array != null && array.length > 0) {
                for (Object obj : array) {
                    json.append(object2json(obj));
                    json.append(",");
                }
                json.setCharAt(json.length() - 1, ']');
            } else {
                json.append("]");
            }
            return json.toString();
        }

        public static String map2json(Map<?, ?> map) {
            StringBuilder json = new StringBuilder();
            json.append("{");
            if (map != null && map.size() > 0) {
                for (Object key : map.keySet()) {
                    json.append(object2json(key));
                    json.append(":");
                    json.append(object2json(map.get(key)));
                    json.append(",");
                }
                json.setCharAt(json.length() - 1, '}');
            } else {
                json.append("}");
            }
            return json.toString();
        }

        public static String set2json(Set<?> set) {
            StringBuilder json = new StringBuilder();
            json.append("[");
            if (set != null && set.size() > 0) {
                for (Object obj : set) {
                    json.append(object2json(obj));
                    json.append(",");
                }
                json.setCharAt(json.length() - 1, ']');
            } else {
                json.append("]");
            }
            return json.toString();
        }

        public static String string2json(String s) {
            if (s == null)
                return "";
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < s.length(); i++) {
                char ch = s.charAt(i);
                switch (ch) {
                    case '"':
                        sb.append("\\\"");
                        break;
                    case '\\':
                        sb.append("\\\\");
                        break;
                    case '\b':
                        sb.append("\\b");
                        break;
                    case '\f':
                        sb.append("\\f");
                        break;
                    case '\n':
                        sb.append("\\n");
                        break;
                    case '\r':
                        sb.append("\\r");
                        break;
                    case '\t':
                        sb.append("\\t");
                        break;
                    case '/':
                        sb.append("\\/");
                        break;
                    default:
                        if (ch >= '\u0000' && ch <= '\u001F') {
                            String ss = Integer.toHexString(ch);
                            sb.append("\\u");
                            for (int k = 0; k < 4 - ss.length(); k++) {
                                sb.append('0');
                            }
                            sb.append(ss.toUpperCase());
                        } else {
                            sb.append(ch);
                        }
                }
            }
            return sb.toString();
        }

        public static String bean2json(Object bean) {
            StringBuilder json = new StringBuilder();
            json.append("{");
            PropertyDescriptor[] props = null;
            try {
                props = Introspector.getBeanInfo(bean.getClass(), Object.class)
                        .getPropertyDescriptors();
            } catch (IntrospectionException e) {
            }
            if (props != null) {
                for (int i = 0; i < props.length; i++) {
                    try {
                        String name = object2json(props[i].getName());
                        String value = object2json(props[i].getReadMethod().invoke(
                                bean));
                        json.append(name);
                        json.append(":");
                        json.append(value);
                        json.append(",");
                    } catch (Throwable e) {
                    }
                }
                json.setCharAt(json.length() - 1, '}');
            } else {
                json.append("}");
            }
            return json.toString();
        }

}
